Flight number record
DL 1647
Delta Air Lines · Los Angeles to Salt Lake City
- Route
- LAX → SLC
- Departs
- 13:25
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1647, check with Delta Air Lines.
DL 1647 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 365 flights, with a median arrival 11 minutes early.
Set against the rest of the country, DL 1647's record is 8 points better than the US average of 77.3%. That gap is worth roughly 81 fewer late arrivals for every thousand flights.
Key figures
On time
85.4%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
101 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
7.5%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 11 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When DL 1647 flies
DL 1647 flies LAX to SLC without a single fixed slot. Its most common scheduled departure was 13:25, used on 109 of 365 flights, with 13:10 (57 flights) and 13:30 (48 flights) next.
- Departs 13:25109 flights29.9%
- Departs 13:1057 flights15.6%
- Departs 13:3048 flights13.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 13:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1647 runs 7 points better at 85.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1647 next to LAX to SLC
Every carrier on LAX to SLC combined arrived on time 87.2% of the time across 4,195 flights, so DL 1647 is 2 points behind it. Delta flew 2,457 flights on the same city pair under all its flight numbers, including this one, and those ran 88.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1647 | 365 | 85.4% | 101 min | 0.27% | A+ |
| All Delta Air Lines on LAX–SLC | 2,457 | 88.4% | 80 min | 0.53% | A+ |
| All carriers on LAX–SLC | 4,195 | 87.2% | 72 min | 0.50% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1647 quarter by quarter
DL 1647 did not run the same all year. Its best quarter was Oct–Dec 2025 at 91.2% on time and its weakest Jul–Sep 2026 at 75.8%, a swing of 15 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202592 flights91.2%
- Jan–Mar 202690 flights84.4%
- Apr–Jun 202691 flights86.5%
- Jul–Sep 202662 flights75.8%
Scale runs 65% to 95%.
By weekday, DL 1647 did best on Wednesday at 92.3% on time and worst on Sunday at 76.5%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1647 runs when it is late
DL 1647 often beats the schedule: 119 of 362 completed flights, 33%, arrived 15 minutes or more early. When DL 1647 is late it tends to be very late: 27 of its 53 late arrivals were an hour or more behind, and 16 were two hours or more.
- 15+ min early119 flights32.9%
- Within 15 min190 flights52.5%
- 15–29 min late14 flights3.9%
- 30–59 min late12 flights3.3%
- 1–2 hours late11 flights3.0%
- 2+ hours late16 flights4.4%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
10 of 62 late departures made up the time and arrived on time, 16% of them. Only 1 left on time and still arrived late.
The worst days
Worst days for DL 1647
The latest arrival of the period was on 26 June 2026, 9 hours 54 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 June 2026 | 9 hours 54 minutes | Carrier |
| 7 December 2025 | 7 hours 56 minutes | Carrier |
| 26 January 2026 | 6 hours 57 minutes | Carrier |
| 30 November 2025 | 4 hours 15 minutes | Carrier |
| 18 April 2026 | 3 hours 57 minutes | Late-arriving aircraft |
Delay causes
Why DL 1647 runs late
Carrier accounts for 74% of the 5,353 delay minutes carriers reported here, and the remaining four split what is left.
- 74%Carrier
- 23%Late-arriving aircraft
- 3%National Airspace System
The largest share of delay minutes, 74%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,975 of the 5,353 delay minutes reported here. The split is drawn from 5,353 delay minutes reported on DL 1647.
Cancellations are rare at 0.27%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
7.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.
The 590 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 365 flights under DL 1647 in the data flew LAX to SLC. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 365 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 1647
For a booking, DL 1647 has one of the better records a US domestic flight can show: 85.4% on time and 0.27% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAX to SLC, every carrier and departure
- SLC to LAX, the return direction
- Delta Air Lines 1318 on the same route91.7%
- Delta Air Lines 1194 on the same route88.5%
- Delta Air Lines 1434 on the same route92.0%
- Delta Air Lines 2311 on the same route78.7%
- Delta Air Lines 2906 on the same route95.4%
- Delta Air Lines 1483 on the same route86.6%
- Los Angeles International (LAX) delay statistics
- Salt Lake City International (SLC) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.